Single and low-lying states dominance in two-neutrino double-beta decay

Abstract

A theoretical analysis of the single-state dominance hypothesis for the two-neutrino double-beta decay rates is performed on the examples of the double-beta decays of 100Mo, 116Cd, and 128Te. We also test the validity of an extended low-lying-state dominance that takes into account the contributions of the low-lying excited states in the intermediate nucleus to the double-beta decay rates. This study has been accomplished for all the double-beta emitters for which we have experimental information on their half-lives. The theoretical framework is a proton-neutron quasiparticle random-phase approximation based on a deformed Skyrme Hartree-Fock mean field with pairing correlations. Our calculations indicate that there are not clear evidences for single- or low-lying-state dominance in the two-neutrino double-beta decay. Finally, we investigate the single electron energy distributions of the outgoing electrons in the double-beta decay processes with an exact treatment of the energy denominators, which could help to a more comprehensive analysis of NEMO-3 data.

19 pages, 6 figures

References in corpus (5)

• Measurement of Neutrino Oscillation by the K2K Experiment
• Nuclear Structure Relevant to Neutrinoless Double Beta Decay: 76Ge and 76Se
• Measurement of double beta decay of 100Mo to excited states in the NEMO 3 experiment
• Overconstrained estimates of neutrinoless double beta decay within the QRPA
• Pair correlations in nuclei involved in neutrinoless double beta decay: 76Ge and 76Se

Cited by in corpus (7)

• Deformation effects on the Gamow-Teller strength distributions in the double-beta decay partners 76Ge and 76Se
• Theoretical mean field and experimental occupation probabilities in the double beta decay system 76Ge to 76Se
• Low-energy structure and $\beta$ decay properties of neutron-rich nuclei in the region of a shape phase transition
• Effects of pairing strength on the nuclear structure and double-$\beta$ decay predictions within the mapped interacting boson model
• Nuclear structure calculations for two-neutrino double-beta decay
• Results on ${}^{82}$Se $2\nu \beta \beta$ with CUPID-0 Phase I
• What can we learn from recent $2\nu \beta \beta$ experiments?